Lipids are macromolecules that are soluble in a non-polar solvent and are a crucial part of the development and maintenance of biological organisms.
Lipids constitute fats, oils, wax, etc.
There are four main types of circulating lipids in the human body namely Low-Density Lipoprotein (LDL), Very Low-Density Lipoprotein (VLDL), High-Density Lipoprotein (HPL), and chylomicrons.
Out of these LDL are said to be 'bad' proteins as they make most of the harmful cholesterol in the body while HDL is the 'good' lipids responsible for carrying excess cholesterol molecules to the liver for excretion.
They are an integral part of an organism in forming the cell structure, synthesis, transportation, and energy storage, and act as hormones as well.
Lipids are usually good for maintaining a healthy state, but in large amounts can be disadvantageous for the body.
Excess amounts of trans or unsaturated lipids may result in fat deposits in blood vessels causing health complications.
There has to be a regulated intake of lipids in order to prevent its bad effects.